Whisk flour, milk, water, salt, pepper, and garlic powder. Dip cauliflower pieces in the batter and let excess drip off. Place on parchment-lined baking sheet. Bake on an upper rack for 15-20 minutes until lightly crisped and browned.
Remove from oven and gently toss the baked cauliflower in a bowl with the hot sauce. Return to pan. Bake for another 5-10 minutes.
For Avocado Crema
Mix all ingredients in a food processor or blender until smooth.
For Slaw
Toss the slaw with some of the avocado crema until it’s nice and creamy.
Assembly
Fill each tortilla with slaw, cauliflower, a drizzle of avocado crema, and crumbled goat feta and enjoy.